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參數(shù)資料
| 型號： | SN54ABT8240 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Scan Test Devices With Octal Buffers(掃描測試裝置(帶八緩沖器)) |
| 中文描述： | 掃描測試設(shè)備與八路緩沖器（掃描測試裝置（帶八緩沖器）） |
| 文件頁數(shù)： | 9/19頁 |
| 文件大?。?/td> | 391K |
| 代理商： | SN54ABT8240 |
SN54ABT8240, SN74ABT8240
SCAN TEST DEVICES WITH OCTAL BUFFERS
SCBS484 – JULY 1994
3–9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
instruction-register opcode description
The instruction-register opcodes are shown in Table 3. The following descriptions detail the operation of each
instruction.
Table 3. Instruction Register Opcodes
BINARY CODE
BIT 7
→
BIT 0
MSB
→
LSB
00000000
SCOPE OPCODE
DESCRIPTION
SELECTED DATA
REGISTER
MODE
EXTEST
BYPASS
Boundary scan
Boundary scan
Test
10000001
Bypass scan
Bypass
Normal
10000010
SAMPLE/PRELOAD
Sample boundary
Boundary scan
Normal
00000011
INTEST
BYPASS
BYPASS
Boundary scan
Boundary scan
Test
10000100
Bypass scan
Bypass
Normal
00000101
Bypass scan
Bypass
Normal
00000110
HIGHZ
Control boundary to high impedance
Bypass
Modified test
10000111
CLAMP
BYPASS
Control boundary to 1/0
Bypass
Test
10001000
Bypass scan
Bypass
Normal
00001001
RUNT
Boundary run test
Bypass
Test
00001010
READBN
Boundary read
Boundary scan
Normal
10001011
READBT
Boundary read
Boundary scan
Test
00001100
CELLTST
Boundary self test
Boundary scan
Normal
10001101
TOPHIP
Boundary toggle outputs
Bypass
Test
10001110
SCANCN
Boundary-control register scan
Boundary control
Normal
00001111
SCANCT
Boundary-control register scan
Boundary control
Test
All others
BYPASS
Bypass scan
Bypass
Normal
Bit 7 is used to maintain even parity in the 8-bit instruction.
The BYPASS instruction is executed in lieu of a SCOPE
instruction that is not supported in the
′
ABT8240.
boundary scan
This instruction conforms to the IEEE Standard 1149.1-1990 EXTEST and INTEST instructions. The BSR is
selected in the scan path. Data appearing at the device input pins is captured in the input BSCs, while data
appearing at the outputs of the normal on-chip logic is captured in the output BSCs. Data that has been scanned
into the input BSCs is applied to the inputs of the normal on-chip logic, while data that has been scanned into
the output BSCs is applied to the device output pins. The device operates in the test mode.
bypass scan
This instruction conforms to the IEEE Standard 1149.1-1990 BYPASS instruction. The bypass register is
selected in the scan path. A logic 0 value is captured in the bypass register during Capture-DR. The device
operates in the normal mode.
sample boundary
This instruction conforms to the IEEE Standard 1149.1-1990 SAMPLE/PRELOAD instruction. The BSR is
selected in the scan path. Data appearing at the device input pins is captured in the input BSCs, while data
appearing at the outputs of the normal on-chip logic is captured in the output BSCs. The device operates in the
normal mode.
P
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